1. Planetary Exploration Group; The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
2. Department of Geological Sciences; Brown University; Providence Rhode Island USA
3. Lunar and Planetary Laboratory; University of Arizona; Tucson Arizona USA
4. China University of Geosciences (Wuhan); Wuhan Hubei China
5. Institute of Planetary Research; Deutsches Zentrum für Luft und Raumfahrt; Berlin Germany
6. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington D.C. USA
7. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA